Pneumatic plug for pipelines



FIG. 1 is a top plan view of a pneumatic plug for pipelines, showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a side elevational view thereof and showing the side opposite that of FIG. 2; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a pneumatic plug for pipelines, as shown and described. 